[Numpy-discussion] need help building a numpy extension that uses fftpack on windows

Ralf Gommers ralf.gommers@googlemail....
Fri Jun 3 04:15:04 CDT 2011

On Thu, Jun 2, 2011 at 9:33 PM, Robert Kern <robert.kern@gmail.com> wrote:

> On Thu, Jun 2, 2011 at 14:07, Ralf Gommers <ralf.gommers@googlemail.com>
> wrote:
> >
> > On Wed, Jun 1, 2011 at 5:45 PM, martin smith <gmane@blindgoat.org>
> wrote:
> >>
> >> I have a bit of code that performs multi-taper power spectra using numpy
> >> and a C extension module.  The C portion consists of an interface file
> >> and a python-unaware computational file.  The latter invokes fftpack.
> >>
> >> The straightforward setup.py appended below works fine on Linux.  On
> >> Windows using MinGW it's not so good. I first created a libpython27.a
> >> file following instructions on the web.  The C code now compiles but
> >> fails to link since there is no fftpack_lite.so on Windows.  I can't
> >> find an fftpack_lite.dll (or even the source for fftpack_lite) and don't
> >> know where to turn.
> >
> > Python dll's on Windows have a .pyd extension, there should be a
> > fftpack_lite.pyd file. But you should be able to just leave off the
> > extension, so it does the right thing on any platform.
> >
> > Also, the way you specified library_dirs doesn't work if numpy is not in
> > site-packages, better to use something like:
> >      library_dirs = [os.path.join(numpy.__path__[0], 'fft')]
> That said, there is no good cross-platform way to link against other
> Python extension modules. Please do not try. You will have to include
> a copy of the FFTPACK code in your own extension module.
> Coming back to #608, that means there is no chance that  the C version will
land in scipy, correct? We're not going to ship two copies of FFTPACK. So
the answer should be "rewrite in Python, if that's too slow use Cython".

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